The man accused of killing 10 grocery shoppers in Boulder, Colorado, in March 2021 entered a plea of not guilty by reason of insanity today.

Ten people were killed during the shooting on March 22, 2021.

A Colorado district attorney found Officer Richard Steidell to be justified.

The police officer who shot and injured a mass shooting suspect at a Boulder, Colorado, grocery store won't face criminal charges.

More charges have been filed against the man accused of killing 10 people at a King Soopers grocery store on March 22.

The suspect now faces additional charges including first-degree attempted murder, first-degree assault and carrying prohibited large capacity magazines.

The suspect is expected to face additional charges as new questions are being raised about his mental health.

Authorities said Friday that the Ruger AR-556, that was purchased by suspect Ahmad Alissa just six days before the attack, was the murder weapon. The semi-automatic pistol was bought legally.

Family members and more remember the victims of the mass shooting at a grocery store in Boulder, Colorado.

A Colorado boy handed out flowers to help comfort King Soopers employees after a mass shooting.

The Boulder mass shooting suspect has been moved to an undisclosed facility because of death threats, according to authorities.

King Soopers, the Colorado-based grocery chain that saw one of its stores become the site of a mass shooting, is donating $1 million to support community healing.

A motive has not been determined in the mass shooting that killed 10 people at a Boulder, Colorado, grocery store.

The grocery store's donation will go toward supporting the needs of victims, families, survivors and the community.

Ahmad Alissa, 21, who is suspected to be responsible for the grocery store shooting that killed 10 people, is scheduled to make his first court appearance Thursday morning.

The judge informed 21-year-old Ahmad Alissa that he faces 10 counts of murder and a single count of attempted murder in connection with Monday’s massacre in Boulder, Colorado.

The suspect’s defense team asked for a delay in trial to assess his mental health.

The 21-year-old accused of gunning down 10 people at a Boulder, Colorado, grocery store is due in court Thursday.

The 21-year-old accused of killing 10 people, including a police officer, at a King Soopers grocery store in Boulder, Colorado, made his first court appearance Thursday.

Crowds lined the streets of Boulder, Colorado, to honor the motorcade bearing the casket of officer Eric Talley. Accused suspect Ahmad Alissa will make his first court appearance Thursday.

Kevin Mahoney, 61, was about to become a grandfather. Another victim, Denny Strong, 20, dreamed of becoming a pilot.

Plus, COVID cases are rising in 16 states as President Joe Biden announces details of a new vaccine shipment this week, and two new Muppets join “Sesame Street” to help kids learn about race.

Plus, all jurors have been seated for the trial of Derek Chauvin, and “Shark Tank” co-host and entrepreneur Barbara Corcoran gives advice for small businesses in the pandemic.

Authorities say suspect Ahmad Alissa, 21, purchased the military-style rifle one week before he allegedly killed 10 people at a King Soopers supermarket.

Investigators claim Ahmed Alissa legally purchased a Ruger AR-556 semiautomatic pistol one week before the shooting spree, despite family members’ concerns about his mental health.

Colorado has a tragic history of mass shootings, including the 1999 Columbine shooting and the 2012 Aurora theater attack.

After a gunman opened fire at a grocery store where residents gathered to shop and receive COVID-19 vaccines, "The View" reacts and questions if Americans will push for stricter gun laws.

Colorado state representative Thomas Sullivan, who lost his son in the Aurora theater shooting in 2012, speaks about gun control efforts at the state and federal level.

Chief Maris Herold became emotional while describing Eric Talley, the officer who was killed in the supermarket shooting Monday. She said Talley leaves behind seven children.

Police identify the victims and gunman in the mass shooting at the King’s Soopers supermarket in Boulder.

Sarah Moonshadow, who was at the grocery store when the gunman opened fire, recounts her experience during the shooting.

Authorities say at least 10 people were killed, including a city police officer, after an armed man with a rifle, opened fire in a supermarket parking lot on Monday afternoon.

Police said 10 people were killed, including an officer, after a shooting at a King Soopers grocery store in Boulder, Colorado.

The suspect is in custody after opening fire at a King Soopers grocery store in Boulder, Colorado.

President Joe Biden called on Congress to pass gun legislation as the country faces its second mass shooting in one week.

According to newly released charges, a family member of the suspect told police he was “playing” with a “machine gun” about two days ago.

Plus, Immigration and Customs Enforcement and the Department of Homeland Security are sued over a sting operation using a fake university and how businesses are handling the return of March Madness.

The 10 victims in Monday's Colorado shooting were identified this morning by police as they continue their investigation into the 21-year-old suspected shooter.

Colorado police arrested a person of interest after a shooting at a King Soopers grocery store in Boulder. Police confirmed 10 people were killed, including an officer.

The names of the nine civilian victims and one police officer killed in Monday’s mass shooting at the King Soopers store in Boulder, Colorado, were released Tuesday. The community mourns their loss.

A suspect was taken into custody. A motive was unclear.

When a gunman opened fire at a Boulder store, Sarah Moonshadow, who was there shopping with her son, timed the gunfire to figure out when to flee to safety.

A person of interest, who was wounded during the incident, was taken into custody, police confirmed.

There are reports of injuries, but no further details are currently available, according to the source.